I may be wrong, but I think Historische Rosen Schuett may have this listed "Hippolyte Jamain" and available for purchase. The color in their photos matches the description for Rose Impératrice.
HMF will not allow me to add a link to the specific page.
We have listed this as 'Hippolyte Jamain' from Lacharme - ex Sangerhausen. 'Mme Hippolyte Jamain' is described as white with pink shading and seems to be extinct.
